question_answer

A chef, on finding his stove out of order, decides to boil the water for his wifes coffee by shaking it in a thermos flask. Suppose that he uses tap water at \[15{}^\circ C\] and that the water falls 30 cm each shake, the chef making 30 shakes each minute. Neglecting any loss of thermal energy by the flask, how long must he shake the flask until the water reaches \[100{}^\circ C\]?

A) \[2.25\,\times {{10}^{3}}\min \]

B) \[3.97\,\times {{10}^{3}}\,\min \]           

C) \[4.00\,\times {{10}^{3}}\,\min \]           

D) \[5.25\,\times {{10}^{3}}\,\min \]